Controlling-switch.



No. 882,602. PATENTED MAR. 24, 1908.

H. E. WHITE. CONTROLLING SWITCH.

APPLICATION FILED SEPT. 18, 1906.

v\/ITN EISS ES I INVENTUR HARULD'EWHITE W4 11 L;

. rent t also be reversed.

voltage equal to the entire voltage of the sys UNITED sTA'r s rignivtr onrron.

HAROLD E. WHITE, or SCHENECTADY, NEW YORK, ASSIGNOR 'ro GENERAL-ELECTRIC.

COMPANY, A CORPORATION or NEW YORK.

CONTROLLING-SWITCH. i

Patented March 24, 1908.

Application filed September 18, 1908. Serial No. 336,051.

To all whom it may concern:

Be it known that I, HAROLD E. WHITE, a citizen of the United States, residing at Schenec'tad county of Schenectady, State of New Yor have invented certain new and useful Improvements in Controlling-Switches,

of which the following is a specification.

My invention relates to controlling switches employing blow-out magnets and is articularly applicable to motor controllers. t is frequently desirable that the are formed at each contact-ii er should always; be blown in the same irection, and since the current throu h the contacters'ma be reversed in di f it has been proposed heretofore, in order to secure the desired result, to provideindividual blow-out coils for each of the fingers, each of which is connected directly in series with its fin er, so that when the direction of ourlirough the finger reverses, the direc tion of current through the blow-out coil will outs are employed it may sometimes happen that adjacent coils may have a difference of tom; and consequently it is necessary to pro vide insulation adapted to withstand this voltage. To secure in a compact structure both an efficient magnetic circuit and the necessary insulation so disposed as to permit unobstructed movement to the expanding arc, presents problems which it is the object of my invention to solve.

My invention in one aspect consists in separating the main poles of the blow-out coils from the coils themselves by insulation andproviding auxiliary pole-pieces for inductively m netizing the m'am poles. By the use of tliese auxiliary pole-pieces an efficient magnetic circuit ma be secured, while at the same time the lnsulation between each coil and its. main pole-piece serves effectively to insulate adjacent/blowout coils from each other. a

My invention will best be understood by reference to the accompanying drawings,in which Figure 1 shows an elevation, partly in cross-section, of a motor controller arranged inaccordance with my invention; Fig. 2

shows a plan view of the same; and Fig. 3 a

detail view in perspective,

In the drawings, A represents the con trollerdrum carrying the movable contacts.

field produced b erent positions 0 the sw1tch,,

hen individual blow- B represents the stationary contact-fingers engaging the drum. C represents the blow-out coils, one of which is provided for each finger, and which are arranged with their axes arallel to the axis of the drum A. These coi s are each connected between a finger B and "the terminal D, to which the connecting, lead for the finger is brou ht, so' that when the current through any ger is reversed the magnetic the corresponding coil is hecoil C may be conveniently wound of'a' cop er strip. The outer turn may be connecte to the terminal post D, as shown in Fig. 2, while the inner turn may be conveniently connected to the contact-finger of the coil, which is electricallyiconnect'ed to the contact-finger B by the iron )lates E, which, beside forming the electrica connection'between the coil and the finger, serveas the auxiliary or primary pole-pieces of the coil. These plates, which are in bothrnagnetic and electrical contact with the core 0, extend in'a plane perpendicular to the core over only a portion of the length of the contactfingers. T he main pole-pieces F are also reversed.

B by connecting it to the core 0 c molded into slabs of insulation Grand extend.

parallel proximity to the points of contactof the contact-fingers and t e controller drum. These main or secondar pole-pieces F arethus insulated from the low-out coils and contactfingers, and are so arated by the insulation from the cores of t 1e blow-out coils; but are inductively magnetized by the primary polepieces E. Since the air-gap between the pole-pieces E and F is of large cross-section and small length, an efiicient magnetic circuit is secured, while at the sametime each coil and finger are effectively, insulated from the adjacent coilxandfingers. 1

lnorder to per it free access to the contact-fingers for the pi ,pose'of inspection and renewals the insulated slabs G carrying'the main pole-pieces are secured to a support H, which is pivotally mounted within the casing so that all of the main .poleieces may be swung outward, as shown in ig. 2.

The several coils are preferably so arranged that the direction of the are, under the influence of the-blow-out field, is as indicated by the arrow in Fig. 2. It will be seen that a large space is provided in this direction, through which the arc may move without t0 the primary polepicces E into.

coming into contact with any other parts of the controller, thus fulfilling one of the important conditions mentioned above. Furthermore, when the controller ishein moved toward oft-position, or co'untencloc :wise as viewed in Fig. 2, the are is blown away from the drum contacts, instead of traveling along them, as would he the case it the direction ol blow-out were reversed, and thus their deterioration from a traveling arc is avoided.

hat I claim new and desire to secure by Letters Patent of the United States, is,- i. In a controlling switch, in coinbiiiation with a rotary drum and c'oi'itactliiigers engaging therewith, individual blow-out coils connected directly in series with the several fingers, auxiliary pole-pieces in magnetic contact with the cores of said coils, and main pole-pieces separated from the auxiliarypoleieces hy-insulation and magnetized induct ivel'y thereby.

2. in a controlling switch, in combination with a rotary drum and 'contaot+fingers en gaging tl'ierowith, individual blow-out coils connected directly in series with the several fingers, auxiliary pole-pieces in magnetic contact with the cores of said eoils,niain polepieces separated from the auxiliary polepieces by insulation and. magnetized inductively thereby, and means for so supporting said niain pole-pieces that they are movable away from the coils to give access to the fingers.

3. In a controlling switch, in combination ithe rotary drain and contact-lingers cngaging therewith, individual blow-out coils connected directly in series with the several fingers, auxiliary pole-pieces in magnetic contact with the cores of said coils, main pole-pieces separated from the auxiliary pole-pieces by insulation and inag'i'ietizcd inductively thereby, and a pivotally-iimunted' member supporting theiiiain pole-pieces;

with a rotary drum and contact-lingers engaging therewith, individual blow-out coils gaging therewith, individual l)lU\\'-0l!i coils connected directly in series with the several lingers. the inner turn of each coil hcing connected lo its core, auxiliary pole-pieces in lil:l; f'!i(tl(' and electrical contact with the .cores ol said coils, main polc-picccs scparatcd coils and in electricalcontact with the lingers, and main pole-pieces separated from the auxiliary polc-picccs hy insulation and magnetized inductively thereby.

7. in a coiitrolling switch, in combination with a rotary drum and contact-lingers engaging therewith. individual blow-out coils tor'tlic several lingers mounted with their "axes parallel with. the axis ol the drum, auxiliary pole-pieces in magnetic coiiiacl with the cores of the coils and extending in l)lll1(.\ perpendicular to their axes, and main polepieces in planes parallel with the. auxiliary pole-picccs hut separated therefrom by insulation and cxtcnding into proximity to the contact points of the lingers.

8. In a controllingswitch, in coinhination with a rotary drum and contact-lingers cngaging ilicrcwilh, individualMow-out coils for the several liner-rs mounted willi their axes parallel with the axis ol' lhe drum, auxiliary rude-pacts in magnetic contact with the cores oi the coils and extending in planes pcrpcndicular to their axes and main polcpieces in planes parallel wilhthc auxiliary 4. In a controiling-switch, in co nliination 1 connected .lire'ctly in series'with the several f fingers, OliQQDtl oi each coil being coni'iected and electrical contact with the cores of said 5. In a controlling switch, in combination with a rotary drum and contact-fingers en- 'iolc-picccs hut separated thei'ci'roni hy in sulation and extending into proximity to the contact points ol the. lingers. the coils and pole-pieces hcing arranged to drive the arcs f lictwccn the lingers and drum contacts in a to its core, auxiliary pole-mecca n magnetic dircction away ilOi'Ii the coils.

In witness \i'hcrcot. l. have hereunto set my hand' this 17th day of September, 1906.

hv' insulation and IIA'RUYI) [-3. Will! 3. Witnesses:

BENJAnix i3. lluil'n, HELEN ()nronn. i 

